US8277485B2 - Pedicle screw system - Google Patents

Pedicle screw system Download PDF

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Publication number
US8277485B2
US8277485B2 US11/810,645 US81064507A US8277485B2 US 8277485 B2 US8277485 B2 US 8277485B2 US 81064507 A US81064507 A US 81064507A US 8277485 B2 US8277485 B2 US 8277485B2
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United States
Prior art keywords
elongate body
ball
head segment
segment
bone screw
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Expired - Fee Related, expires
Application number
US11/810,645
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English (en)
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US20080015586A1 (en
Inventor
Manoj Krishna
Tai Friesem
Steven Brown
William E. Harbottle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DISC MOTION PARTNERS LP
WOLD JOSEPH E
Spinadyne Inc
Original Assignee
Spinadyne Inc
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Priority to US11/810,645 priority Critical patent/US8277485B2/en
Assigned to DISC MOTION TECHNOLOGIES, INC. reassignment DISC MOTION TECHNOLOGIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BROWN, STEVEN, FRIESEM, TAI, KRISHNA, MANOJ
Publication of US20080015586A1 publication Critical patent/US20080015586A1/en
Assigned to DISC MOTION TECHNOLOGIES, INC. reassignment DISC MOTION TECHNOLOGIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HARBOTTLE, WILLIAM E.
Assigned to WOLD, JOSEPH E. reassignment WOLD, JOSEPH E. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DISC MOTION TECHNOLOGIES, INC.
Assigned to DISC MOTION PARTNERS, LP reassignment DISC MOTION PARTNERS, LP ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WOLD, JOSEPH E.
Assigned to SPINADYNE, INC. reassignment SPINADYNE, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DISC MOTION PARTNERS, L.P.
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Publication of US8277485B2 publication Critical patent/US8277485B2/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/8685—Pins or screws or threaded wires; nuts therefor comprising multiple separate parts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass
    • A61B17/7034—Screws or hooks with U-shaped head or back through which longitudinal rods pass characterised by a lateral opening
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7035—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other
    • A61B17/7037—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other wherein pivoting is blocked when the rod is clamped
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7035—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other
    • A61B17/7038—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other to a different extent in different directions, e.g. within one plane only
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7035—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other
    • A61B17/704—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other the longitudinal element passing through a ball-joint in the screw head
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7044—Screws or hooks combined with longitudinal elements which do not contact vertebrae also having plates, staples or washers bearing on the vertebrae
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B2017/8655—Pins or screws or threaded wires; nuts therefor with special features for locking in the bone

Definitions

  • the present invention relates to bone screws, and more particularly, to a pedicle screw system and method of use.
  • Spinal prostheses, implants, and fixation systems are routinely coupled to a portion of a spinal column to treat various conditions. Such procedures often employ one or more screws or similar hardware to anchor and/or secure a portion of a prosthesis or fixation structure, such as a rod assembly or the like.
  • Important considerations for the implantation of spinal instrumentation include the ability to provide safe insertion, rigid fixation, and ease and adaptability of implantation.
  • Dynamic stabilization of the spine represents a modern concept in spinal fixation where a posterior pedicle screw-based device substantially controls the motion of the spinal segment.
  • Such dynamic stabilization devices are often anchored to pedicle screws, and as the system is not particularly rigid, there may be increased stresses transmitted to the pedicle screw, resulting in a greater likelihood that the screw will loosen and/or migrate.
  • a dynamic stabilization system may include an artificial lumbar disc, where motion of a posterior stabilizer corresponds and/or complements the motion of the disc. In such a system, a portion of the movement and/or range of motion of the system can be accommodated by the pedicle screw itself in combination with the posterior stabilizer.
  • fixation assembly having a desired degree of freedom of angulation and rotation with respect to a portion of an implant or prosthesis or the portion of the screw embedded in the bone, and further provide for expeditious implantation. It is further desirable to provide an implant system that provides a means of locking the fixation screw into the implant and to prevent loosening or screw migration. In addition, the need exists for such a system to be provided in implants suitable for small surgical areas, such as certain spinal regions, which is reliable, durable, and thereby provides long term fixation support.
  • fixation assembly that resists loosening by providing a range of motion between a head portion and a shaft, such that forces experienced by the fixation assembly are dissipated through controlled motion. It would also be desirable for a fixation assembly to include a desired degree of motion to allow for changes needed in orientation of an implant that are requisite for dynamic stabilization devices.
  • the present invention provides a screw system for the affixation of a spinal device or construct to a portion of a spinal column.
  • An embodiment of a screw system in accordance with the present invention may generally include a bone fixation element having an elongate body that may include a first end and a second end, as well as a longitudinal axis extending throughout the length of the elongate body.
  • the fixation element may further include a threaded segment, a neck segment, and a head segment, where the head segment is engageable with and/or able to receive at least a portion of an implant, structure, or prosthesis to be coupled to a portion of the spinal column.
  • the fixation element of the present invention may further include a first ball that is movably positionable within the opening of the head segment of the affixation element.
  • the first ball may be able to freely rotate about multiple axes within the opening of the head segment, and alternatively, the first ball may be restricted to movement along a single axis.
  • the fixation element of the present invention may further include a set screw that is rotatably positionable within at least a portion of the head segment.
  • the fixation element of the present invention may further include an anchoring element movably coupled to the fixation element to reduce the likelihood that the fixation element loosens, rotates and/or otherwise migrates once it is implanted.
  • One or more protrusions may also be included on the anchoring element, where the one or more protrusions may be tapered and/or have a pointed tip to facilitate insertion into a tissue region.
  • the fixation element of the present invention may include a head segment removably engageable with the threaded segment of the elongate body, as well as a second ball engageable with the head segment and/or the neck segment.
  • a pin may be positionable within passages or openings of the head segment, the second ball, and/or the neck segment of the elongate body.
  • the pin may have a length such that the pin is positionable to pass through all three of the passages/openings, thereby connecting all three components securely and limiting the amount of rotation and/or movement between the respective components.
  • the pin may have a length such that the pin only passes through any two of the head segment, second ball, and/or the neck segment of the fixation element to retain the desired degrees-of-freedom about which those components may move with respect to each other.
  • FIG. 1 is an illustration of an embodiment of a fixation element in accordance with the present invention
  • FIG. 2 is a side view of the fixation element of FIG. 1 ;
  • FIG. 3 is an additional side view of the fixation element of FIG. 1 ;
  • FIG. 4 is a perspective view of the fixation element of FIG. 1 ;
  • FIG. 5 is an additional perspective view of the fixation element of FIG. 1 ;
  • FIG. 6 is an illustration of an embodiment of a fixation element in accordance with the present invention.
  • FIG. 7 is an additional illustration of the fixation element of FIG. 6 ;
  • FIG. 8 is another illustration of the fixation element of FIG. 6 ;
  • FIG. 9 is an illustration of an embodiment of a fixation element in accordance with the present invention.
  • FIG. 10 is a perspective view of the fixation element of FIG. 9 ;
  • FIG. 11 is a top view of the fixation element of FIG. 9 ;
  • FIG. 12 is a bottom view of the fixation element of FIG. 9 ;
  • FIG. 13 is a side view of the fixation element of FIG. 9 ;
  • FIG. 14 is a cross-sectional view of the fixation element of FIG. 9 ;
  • FIG. 15 is an additional side view of the fixation element of FIG. 9 ;
  • FIG. 16 is an additional cross-sectional view of the fixation element of FIG. 9 ;
  • an embodiment of a screw system in accordance with the present invention may generally include a bone fixation element 10 , such as a pedicle screw or the like, having an elongate body insertable into a desired tissue region.
  • the elongate body of the fixation element 10 may include a first end 12 and a second end 14 , as well as a longitudinal axis 16 extending throughout the length of the elongate body.
  • a tapered or sharpened tip may be located at the first end 12 for insertion of the fixation element 10 .
  • the fixation element 10 may further include a threaded segment 18 adjacent or proximate to the first end, where the threaded segment 18 includes a generally rounded cross-sectional shape extending a substantial length of the elongate body.
  • the threaded segment 18 may further include one or more spirally-oriented grooves or teeth for rotatably engaging a desired region of tissue.
  • the elongate body may further define a neck segment 20 adjacent or otherwise proximate the threaded segment 18 opposite of the tip.
  • the neck segment 20 may be substantially devoid of any threading or spirally-oriented grooves, and may have a length such that the neck segment 20 extends above a tissue surface upon implantation of the fixation element 10 .
  • the neck segment 20 may further define one or more recessed regions 22 extending longitudinally along an exterior surface.
  • the recessed regions 22 may have a substantially rectangular shape, which may extend along a substantial length of the neck segment 20 .
  • the fixation element 10 may further include a head segment 24 adjacent to or otherwise in proximity to the neck segment 20 , where the head segment 24 is engageable with and/or able to receive at least a portion of an implant, structure, or prosthesis to be coupled to a portion of the spinal column.
  • the head segment 24 may generally define an opening 26 therethrough for engagement with a rod or similar construct.
  • the head segment 24 may define a generally “C”-shaped frame such that a rod is positionable through the open side of the “C” and into the opening for secure coupling of the fixation element 10 to the rod.
  • the head segment 24 may define a top wall having a transverse or substantially perpendicular orientation with respect to the longitudinal axis 16 .
  • the head segment 24 may further include a first side wall as well as a bottom side wall, each of which is substantially continuous with the top wall in order to form the “C” shaped construct.
  • a second side wall having a smaller length than the first side wall, where the second side wall extends from the bottom wall but does not extend to top wall. Accordingly, the opening 26 or passage is formed such that a rod may be coupled to the head segment 24 from a side angle or similar approach substantially perpendicular to the longitudinal axis 16 of the elongate body.
  • the head segment 24 may include the opening 26 therethrough as well as have a generally “U”-shaped configuration.
  • the head segment 24 may define first and second side walls extending upward from the neck segment 20 substantially parallel to the longitudinal axis 16 of the elongate body.
  • a rod or spinal device may be positioned in the opening 26 of the head segment 24 in a direction substantially parallel to the longitudinal axis 16 , i.e., the head segment 24 may have a “top-loading” configuration for receiving a rod or similar element.
  • at least a portion of the first and second sidewalls may include threading and/or one or more spirally oriented grooves to rotatably engage a set screw or similar tightening fastener.
  • the fixation element 10 of the present invention may further include a first ball 28 that is movably positionable within the opening 26 of the head segment 24 of the affixation element 10 .
  • the term “ball” is intended to include a spherical, rounded or contoured body or shape.
  • the first ball 28 may define a substantially rounded, curved and/or spherical body, and may further define a bore 30 passing therethrough able to receive a portion of a rod, implant and/or prosthesis.
  • the first ball 28 may be able to freely rotate about multiple axes within the opening of the head segment 24 , and alternatively, the first ball 28 may be restricted to movement along a single axis.
  • the first ball 28 may define a groove or alignment structure circumscribing at least a portion of an outer surface of the ball.
  • the groove or alignment element may correspond to a complimentary structure disposed on an interior wall of the head segment 24 , thereby forming a matable interaction between the head segment 24 and the first ball 28 to restrict or otherwise conform the movement characteristics of the ball to a desired degree.
  • the first ball 28 may include a split, groove, or similar compressible structure 31 or feature such that the first ball includes a reduced dimension upon compression.
  • the fixation element 10 of the present invention may further include a set screw 32 that is rotatably positionable within at least a portion of the head segment 24 .
  • the set screw 32 may define a substantially cylindrical body having one or more spirally oriented grooves on an exterior surface that are rotatably engageable with the threaded portions of the first and second sidewalls of the head segment 24 (or any other two wall surfaces opposite one another, for example, in the “C”-shaped configuration).
  • the set screw 32 may further define a first surface substantially perpendicular to the threaded exterior surface, where the first surface may define a shaped-depression or the like for engagement of a screwdriver or other tool.
  • the set screw 32 may further define a second surface opposite the first surface and similarly perpendicular to the threaded exterior surface, where the second surface includes an arced or contoured region complementary to the curvature of at least a portion of the first ball 28 , described above. As such, the set screw 32 may be rotatably positioned within the head segment 24 of the fixation element 10 to tightly contact a surface of the first ball 28 to prevent movement thereof.
  • the fixation element 10 of the present invention may further include an anchoring element 34 movably coupled to the fixation element 10 to reduce the likelihood that the fixation element 10 loosens, rotates and/or otherwise migrates once it is implanted.
  • the anchoring element 34 may have a central opening therethrough such that the anchoring element 34 is slidable about the neck segment 20 of the fixation element 10 in a direction substantially parallel to the longitudinal axis 16 .
  • the anchoring element 34 may further be prevented from rotating with respect to the elongated body of the fixation element 10 .
  • the neck segment 20 and the anchoring element 34 may each include a complementary shape or feature that prevents their respective rotation, such as a “D” shaped cross section, a rectangular-shaped cross-section, a “lock-and-key” type structure such as a groove and protrusion or the like as is known in the art.
  • One or more protrusions 36 may also be included on the anchoring element 34 , where the one or more protrusions 36 may be tapered and/or have a pointed edge to facilitate insertion into a tissue region. At least a portion of the one or more protrusions 36 may further be positionable within a portion of the one or more recessed regions 22 of the neck segment 20 .
  • the fixation element 10 of the present invention may include the head segment 24 removably engageable with the threaded segment 18 and/or the neck segment 20 of the elongate body.
  • the head segment 24 may have either of the “U” or “C”-shaped configurations as described above, and the head segment 24 may further include a hollowed bottom portion as well as an opening 38 in a side wall of the bottom portion.
  • the neck segment 20 of the elongate body may further include a passage 40 therethrough such that at least a portion of the neck segment 20 is positionable within the hollowed bottom portion of the head segment 24 , where the opening 38 in the side wall of the head segment 24 is alignable with the passage 40 of the neck segment 20 .
  • the fixation element 10 may further include a second ball 42 engageable with the head segment 24 and/or the neck segment 20 .
  • the second ball 42 may generally define rounded, curved, and/or spherical body having a first passage therethrough that is substantially parallel to the longitudinal axis 16 of the elongate body of the fixation element 10 , where at least a portion of the neck segment 20 is positionable within the first passage 44 of the second ball 42 .
  • the second ball 42 may further define a second passage 46 extending therethrough in a direction substantially perpendicular to the longitudinal axis 16 of the elongate body, where the second passage 46 is alignable with the passage 40 in the neck segment 20 of the fixation element 10 , as well as the opening 38 in the bottom portion of the head segment 24 .
  • the second ball 42 may be shaped to include multiple surfaces having a plurality of radii.
  • the second ball 42 may have a first radii about a first portion of an outer surface, while having a second radii about a second portion of the outer surface.
  • the second ball 42 may have the ability to pass through areas having different clearances by simply rotating and/or manipulating the particular orientation of the second ball 42 . Accordingly, the second ball 42 may be securely positioned through a particular opening then rotated to prevent the second ball 42 from being removed through that same opening due to the varying radii.
  • the fixation element 10 of the present invention may further include a pin 48 positionable within at least a portion of the opening 38 in the side of the bottom portion of the head segment 24 , the second passage 46 in the second ball 42 , and/or the passage 40 in the neck segment 20 of the elongate body.
  • the pin 48 may have a length such that the pin 48 is positionable to pass through all three of the passages/openings, thereby connecting all three components (i.e., the neck segment 20 , second ball 42 , and head segment 24 ) securely and limiting the amount of rotation and/or movement between the respective components.
  • the pin 48 may have a length such that the pin 48 only passes through any two of the head segment 24 , second ball 42 , and/or the neck segment 20 of the fixation element 10 to retain the desired degrees-of-freedom about which those components may move with respect to each other.
  • the components may be able to simply pivot about a longitudinal axis 50 of the pin.
  • the head segment 24 may form a ball-and-socket configuration with the second ball 42 /neck segment 20 of the fixation device, thereby providing additional degrees-of-freedom of movement.
  • the bone fixation element 10 may be rotatably inserted into a desired tissue region, such as a vertebral pedicle, a spinal structure or other physiological region.
  • a desired tissue region such as a vertebral pedicle, a spinal structure or other physiological region.
  • the fixation device includes a head segment 24 that is releasably engageable with the neck segment 20 , threaded segment 18 , and/or the second ball 42
  • the fixation element 10 may be configured to provide the desired degree of movement.
  • the pin 48 may be engaged with the head segment 24 , second ball 42 , and/or the neck segment 20 where the pin 48 may have a length such that the pin only passes through a combination of the head segment 24 , second ball 42 , and/or the neck segment 20 of the fixation element 10 to retain the desired degrees-of-freedom about which those components may move with respect to each other.
  • the threaded segment 18 may be substantially engaged with the desired tissue, and at least a portion of the neck segment 20 and/or the head segment 24 may extend above a surface of the tissue in which the fixation element 10 is implanted.
  • a rod or a portion of an implant, prosthesis, or fixation structure may be positioned at least partially within the head segment 24 of the fixation element 10 .
  • a portion of an implant or prosthesis may simply be coupled to the head segment 24 through a compression fit or by similarly “snapping” the desired portion of the implant into place.
  • the fixation device include the first ball 28 movably positionable within a portion of the head segment 24
  • the rod or portion of the implant to be coupled may be engaged with the first ball 28 , and then the first ball 28 and the portion of the implant may be positioned within the head segment 24 .
  • the portion of the implant to be engaged with the fixation element 10 may be manipulated with the first ball 28 to overcome any angular or positioning deficiencies caused during implantation, which could lead to unanticipated torque and/or stress on the fixation element 10 and lead to loosening or migration of both the fixation element 10 and the implant.
  • the first ball also allows devices attached to the fixation element to be adjusted as desired by the surgeon.
  • the set screw 32 may be rotatably tightened to securely fix both the first ball 28 and the prosthesis in position. Further, in tightening the set screw, the first ball may be compressed (via a groove, split, or the like, as previously discussed) to tighten around the rod to provide a secure connection and fixation of the respective components.
  • the anchoring element 34 may be moved with respect to the neck segment 20 and/or the threaded segment 18 such that the one or more protrusions 36 are driven into the tissue region in proximity to the fixation element 10 .
  • the likelihood that the fixation element 10 will loosen, rotate and/or otherwise migrate during the duration of the implantation may be significantly reduced if not eliminated.

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Surgery (AREA)
  • Neurology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
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  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
US11/810,645 2006-06-07 2007-06-06 Pedicle screw system Expired - Fee Related US8277485B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/810,645 US8277485B2 (en) 2006-06-07 2007-06-06 Pedicle screw system

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US81150506P 2006-06-07 2006-06-07
US11/810,645 US8277485B2 (en) 2006-06-07 2007-06-06 Pedicle screw system

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US20080015586A1 US20080015586A1 (en) 2008-01-17
US8277485B2 true US8277485B2 (en) 2012-10-02

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US (1) US8277485B2 (de)
EP (2) EP2032053A2 (de)
AT (1) ATE505145T1 (de)
DE (1) DE602007013910D1 (de)
WO (1) WO2007146032A2 (de)

Cited By (18)

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US11819249B2 (en) 2009-06-15 2023-11-21 Roger P. Jackson Pivotal bone anchor assembly having twist-in-place insert with forced interference downward displacement
US11779374B2 (en) 2009-06-15 2023-10-10 Roger P. Jackson Pivotal bone anchor assembly with non-pivoting, non-rotatable retainer
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US10765455B2 (en) 2009-06-15 2020-09-08 Roger P. Jackson Pivotal bone anchor twist-in-place friction fit insert with side notches
US9918745B2 (en) 2009-06-15 2018-03-20 Roger P. Jackson Polyaxial bone anchor with pop-on shank and winged insert with friction fit compressive collet
US10813671B2 (en) 2009-06-15 2020-10-27 Roger P. Jackson Method of assembling a bone anchor receiver assembly having an insert with rotation blocking extensions and a downward facing collet
US10813672B2 (en) 2009-06-15 2020-10-27 Roger P. Jackson Pivotal bone anchor assembly having insert with rotation blocking extensions and downward facing collet
US20120046700A1 (en) * 2009-06-15 2012-02-23 Jackson Roger P Polyaxial bone anchor with pop-on shank and pivotable retainer
US10856911B2 (en) 2009-06-15 2020-12-08 Roger P. Jackson Pivotal bone anchor assembly having insert with rotation blocking extensions and downward facing collet
US11471195B2 (en) 2009-06-15 2022-10-18 Roger P. Jackson Pivotal bone anchor assembly with circumferential multi-directional increased angulation
US10869694B2 (en) 2009-06-15 2020-12-22 Roger P. Jackson Pivotal bone anchor assembly with independent locking by a tool engaging an insert
US10918420B2 (en) 2009-06-15 2021-02-16 Roger P. Jackson Pivotal bone anchor assembly with forced downward displacement of a compression insert by a tool
US11464548B2 (en) 2009-06-15 2022-10-11 Jackson Roger P Pivotal bone anchor assembly with receiver having vertical tool engagement groove
US10945768B2 (en) 2009-06-15 2021-03-16 Roger P. Jackson Pivotal bone anchor assembly insert with upright arms and rotation blocking extensions
US10973555B2 (en) 2009-06-15 2021-04-13 Roger P. Jackson Medical implant receiver assembly with internal insert positioning and arm break-off extensions above horizontal tool engagement grooves
US11464549B2 (en) 2009-06-15 2022-10-11 Roger P. Jackson Pivotal bone anchor assembly with horizontal tool engagement grooves and insert with upright arms having flared outer portions
US9883892B2 (en) 2009-06-15 2018-02-06 Roger P. Jackson Polyaxial bone anchor with pop-on shank, friction fit retainer, winged insert and low profile edge lock
US11109896B2 (en) 2009-06-15 2021-09-07 Roger P. Jackson Uniplanar bone anchor assembly
US11116548B2 (en) 2009-06-15 2021-09-14 Roger P. Jackson Pivotal bone anchor assembly with receiver having tool engagement grooves and increased shank angulation
US11147592B2 (en) 2009-06-15 2021-10-19 Roger P. Jackson Pivotal bone anchor assembly configured for independent provisional locking with insert having rotation blocking extensions
US11185352B2 (en) 2009-06-15 2021-11-30 Roger P. Jackson Pivotal bone anchor assembly with internal insert positioning and arm break-off extensions above horizontal tool engagement grooves
US10172649B2 (en) 2009-06-15 2019-01-08 Roger P. Jackson Bottom-loaded pivotal bone anchor assembly with non-pivoting retainer and deployable insert
US11419636B2 (en) 2009-06-15 2022-08-23 Roger P. Jackson Pivotal bone anchor assembly with friction fit insert having rotation blocking extensions
US12016594B2 (en) 2009-10-05 2024-06-25 Roger P. Jackson Pivotal bone anchor assembly with temporary positional locking by tooling
US10939940B2 (en) 2010-11-02 2021-03-09 Roger P. Jackson Pivotal bone anchor assembly with pressure insert and snap on articulating retainer
US11918256B2 (en) 2010-11-02 2024-03-05 Roger P. Jackson Pivotal bone anchor assembly with snap on articulating retainer
US20150173804A1 (en) * 2012-07-24 2015-06-25 CARBOFIX IN ORTHOPEDICS LLC a corporation Spine system and kit
US10543021B2 (en) 2014-10-21 2020-01-28 Roger P. Jackson Pivotal bone anchor assembly having an open ring positioner for a retainer
US9924975B2 (en) 2014-10-21 2018-03-27 Roger P. Jackson Bone anchor having a snap-fit assembly
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US20200268417A1 (en) * 2019-02-27 2020-08-27 Bret Michael Berry Tulip head and collet for a poly axial screw
US10751091B1 (en) * 2019-02-27 2020-08-25 Bret Michael Berry Tulip head and collet for a poly axial screw
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EP2050408A1 (de) 2009-04-22
WO2007146032A3 (en) 2008-06-19
US20080015586A1 (en) 2008-01-17
EP2032053A2 (de) 2009-03-11
DE602007013910D1 (de) 2011-05-26
ATE505145T1 (de) 2011-04-15
WO2007146032A2 (en) 2007-12-21
EP2050408B1 (de) 2011-04-13

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